CN103982285A - Engine exhaust pipe based on SCR tail gas aftertreatment technology - Google Patents
Engine exhaust pipe based on SCR tail gas aftertreatment technology Download PDFInfo
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- CN103982285A CN103982285A CN201410243783.6A CN201410243783A CN103982285A CN 103982285 A CN103982285 A CN 103982285A CN 201410243783 A CN201410243783 A CN 201410243783A CN 103982285 A CN103982285 A CN 103982285A
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Abstract
The invention discloses an engine exhaust pipe based on an SCR tail gas aftertreatment technology, and belongs to the technical field of engine tail gas aftertreatment. The engine exhaust pipe comprises an inner-layer exhaust pipe body and an outer-layer exhaust pipe body which are sleeved together, the inner-layer exhaust pipe body and the outer-layer exhaust pipe body are integrated thin-wall special-shaped bending pipes formed through hydraulic forming and machining, the two ends of the inner-layer exhaust pipe body and the two ends of the outer-layer exhaust pipe body are sealed, and a vacuum cavity used for heat insulation and heat preservation is formed between the inner-layer exhaust pipe body and the outer-layer exhaust pipe body. The engine exhaust pipe has the excellent heat insulation and heat preservation performance, the conversion rate of Nx in an SCR tail gas aftertreatment system can be fully guaranteed even under the low temperature state, reliability is high, cost is greatly lowered, and the technical problem of SCR tail gas aftertreatment is solved.
Description
Technical field
The present invention relates to motor exhaust post-processing technology field, especially relate to a kind of engine exhaust pipe based on SCR exhaust aftertreatment technology.
Background technique
Selective catalytic reduction SCR technology is the mainstream technology route of state four and more maximum discharge rules, in order to reach suitable Nx conversion ratio, needs delivery temperature need be controlled at 230 ℃-450 ℃.During low load operation, gas exhaust manifold enters approximately 250 ℃ of the waste gas minimum temperatures of offgas duct, and tail gas can be greater than 40 ℃ by the temperature reduction of conventional pipe fitting, cannot reach suitable Nx conversion ratio, therefore must take Insulation to control exhaust temperature depreciation.For the demand of SCR system exhaust pipe insulation, in order to reach heat insulation effect, the mode at exhaust tube wall parcel collet or thermal baffle of available technology adopting, the shortcoming of collet is, corrosion-resistant, weather-resistant property is poor, and outward appearance is not attractive in appearance, and collet mostly needs import, and cost is higher; And thermal baffle takes up room greatly, cost is also higher.
Summary of the invention
Technical problem to be solved by this invention is: a kind of engine exhaust pipe based on SCR exhaust aftertreatment technology is provided, there is excellent heat preservation and insulation, even under low-temperature condition, also can fully guarantee the conversion ratio of the Nx in SCR exhaust gas aftertreatment system, reliability is high, and cost reduces greatly, overcome the technical barrier of SCR exhaust aftertreatment.
For solving the problems of the technologies described above, technological scheme of the present invention is: the engine exhaust pipe based on SCR exhaust aftertreatment technology, comprise the internal layer exhaust pipe and the outer exhaust pipe that are set in together, described internal layer exhaust pipe and outer exhaust pipe are the integral type thin-walled opposite sex bend pipe processing by shaped by fluid pressure, setting is all sealed at described internal layer exhaust pipe and outer exhaust pipe two ends, is formed for vacuum cavity heat insulation and insulation between described internal layer exhaust pipe and outer exhaust pipe.
Preferably, the tube wall of described outer exhaust pipe is provided with some the concavo-convex stiffening ribs that process by shaped by fluid pressure.
Preferably, the variable cross section body of described outer exhaust pipe for processing by shaped by fluid pressure.
Preferably, the variable cross section body of described internal layer exhaust pipe for processing by shaped by fluid pressure.
Preferably, described outer exhaust pipe is provided with the annular groove for positioning lathe dog.
Preferably, described internal layer exhaust pipe and outer exhaust pipe two ends are sealed by flange part or are passed through flanging seal.
Preferably, described internal layer exhaust pipe and outer exhaust pipe are thin-wall stainless steel or thin-walled carbon pipe.
Preferably, the wall thickness of described internal layer exhaust pipe and outer exhaust pipe is 0.6-1mm.
Adopted technique scheme, beneficial effect of the present invention is: because the engine exhaust pipe based on SCR exhaust aftertreatment technology comprises internal layer exhaust pipe and outer exhaust pipe and two ends, all seal setting, and internal layer exhaust pipe and outer exhaust pipe are the integral type thin-walled opposite sex bend pipe processing by shaped by fluid pressure, between internal layer exhaust pipe and outer exhaust pipe, form vacuum cavity, vacuum cavity has excellent heat preservation and insulation, even under low-temperature condition, also can guarantee that the depreciation of temperature is in 10 ℃, avoid aqueous solution of urea crystallization, fully guaranteed the conversion ratio of the Nx in SCR exhaust gas aftertreatment system, the integral type thin-wall stainless steel opposite sex bend pipe that shaped by fluid pressure processes, from weatherability, ageing-resistant, the thermal baffle and the collet that in decay resistance and reliability, are all better than available technology adopting, replaced many places welding, effectively avoided product failure, greatly improved the reliability of product, and outward appearance is novel, promoted product specification, and than thermal baffle and collet lightweight more than 20%, structural strength is higher, therefore overall cost has more advantage.In addition, this engine exhaust pipe also can be applicable in the type of heat insulation demand, and effectively protection package is rolled in the wire harness on outlet pipe.In addition, due to the petrol engine thermal efficiency 30% left and right, the diesel engine thermal efficiency 40% left and right, its loss part more than 50% is got rid of with tail gas, this engine exhaust pipe provides a kind of new way for efficiently collecting using waste heat from tail gas, for example, heat-preservation exhaust pipe is introduced hollow compartment plate by high-temperature tail gas, can effectively solve the technical barrier that cold area engineering vehicle compartment freezes and can not normally dig.
Because the tube wall of outer exhaust pipe is provided with some the concavo-convex stiffening ribs that process by shaped by fluid pressure, when having reduced body thickness, further improved the structural strength of engine exhaust pipe.
Because outer exhaust pipe and internal layer exhaust pipe are the variable cross section body processing by shaped by fluid pressure, the pipe structure of variable cross section can be saved material on the basis of proof strength, further realizes lightweight.
Because outer exhaust pipe is provided with annular groove, can directly with clip, to this engine exhaust pipe, be fixed, and improve the structural strength of engine exhaust pipe.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is that Fig. 1 is at the sectional view at A-A place;
Fig. 3 is the stereogram of Fig. 1;
Wherein: 1, internal layer exhaust pipe; 2, outer exhaust pipe; 3, vacuum cavity; 4, concavo-convex stiffening rib; 5, annular groove; 6, clip; 7, flange part; 8, lapped pipe end.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Shown in common with Fig. 3 as shown in Figure 1, Figure 2, engine exhaust pipe based on SCR exhaust aftertreatment technology, comprise the internal layer exhaust pipe 1 and the outer exhaust pipe 2 that are set in together, internal layer exhaust pipe 1 is with outer exhaust pipe 2 the integral type thin-walled opposite sex bend pipe processing by shaped by fluid pressure, internal layer exhaust pipe 1 all seals setting with outer exhaust pipe 2 two ends, is formed for vacuum cavity 3 heat insulation and insulation between internal layer exhaust pipe 1 and outer exhaust pipe 2.
The tube wall of outer exhaust pipe 2 is provided with some the concavo-convex stiffening ribs 4 that process by shaped by fluid pressure, when having reduced body thickness, has further improved the structural strength of engine exhaust pipe.The variable cross section body of outer exhaust pipe 2 for processing by shaped by fluid pressure, the variable cross section body of internal layer exhaust pipe 1 for processing by shaped by fluid pressure, the pipe structure of variable cross section also can be saved material on the basis of proof strength, further realizes lightweight.
In the present invention, the integral type thin-walled opposite sex bend pipe that shaped by fluid pressure processes only has a weld seam longitudinally, laterally there is no weld seam, from completely different by the body that repeatedly laterally welding forms, can effectively avoid product failure, greatly improved the reliability of product, and outward appearance is novel, has promoted product specification.
Outer exhaust pipe 2 is provided with annular groove 5, can directly with 6 pairs of these engine exhaust pipe of clip, be fixed, and improve the structural strength of engine exhaust pipe.
Internal layer exhaust pipe 1 seals by flange part 7 with outer exhaust pipe 2 two ends or passes through flanging seal, in the present embodiment, internal layer exhaust pipe 1 adopts flange part 7 with outer exhaust pipe 2 one end, the other end is lapped pipe end 8, and internal layer exhaust pipe 1 is thin-wall stainless steel or thin-walled carbon pipe with outer exhaust pipe 2.Internal layer exhaust pipe 1 is 0.6-1mm with the wall thickness of outer exhaust pipe 2.
The vacuum cavity 3 of engine exhaust pipe of the present invention has excellent heat preservation and insulation, even under low-temperature condition, also can guarantee that the depreciation of temperature is in 10 ℃, avoid aqueous solution of urea crystallization, fully guaranteed the conversion ratio of the Nx in SCR exhaust gas aftertreatment system, the integral type thin-wall stainless steel opposite sex bend pipe that shaped by fluid pressure processes is from weatherability, ageing-resistant, the thermal baffle and the collet that in decay resistance and reliability, are all better than available technology adopting, replaced many places welding, effectively avoided product failure, greatly improved the reliability of product, and outward appearance is novel, promoted product specification, and than thermal baffle and collet lightweight more than 20%, structural strength is higher, therefore overall cost has more advantage.In addition, this engine exhaust pipe also can be applicable in the type of heat insulation demand, and effectively protection package is rolled in the wire harness on outlet pipe.In addition, due to the petrol engine thermal efficiency 30% left and right, the diesel engine thermal efficiency 40% left and right, its loss part more than 50% is got rid of with tail gas, this engine exhaust pipe provides a kind of new way for efficiently collecting using waste heat from tail gas, for example, heat-preservation exhaust pipe is introduced hollow compartment plate by high-temperature tail gas, can effectively solve the technical barrier that cold area engineering vehicle compartment freezes and can not normally dig.
In sum, the present invention is particularly suitable in SCR exhaust aftertreatment technology, vacuum cavity 3 has excellent heat preservation and insulation, even under low-temperature condition, also can fully guarantee the conversion ratio of the Nx in SCR exhaust gas aftertreatment system, reliability is high, and cost reduces greatly, has overcome the global problem of SCR exhaust aftertreatment technology.
The present invention is not limited to above-mentioned concrete mode of execution, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, all conversion of having done, within all dropping on protection scope of the present invention.
Claims (8)
1. the engine exhaust pipe based on SCR exhaust aftertreatment technology, it is characterized in that, comprise the internal layer exhaust pipe and the outer exhaust pipe that are set in together, described internal layer exhaust pipe and outer exhaust pipe are the integral type thin-walled opposite sex bend pipe processing by shaped by fluid pressure, setting is all sealed at described internal layer exhaust pipe and outer exhaust pipe two ends, is formed for vacuum cavity heat insulation and insulation between described internal layer exhaust pipe and outer exhaust pipe.
2. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 1, is characterized in that, the tube wall of described outer exhaust pipe is provided with some the concavo-convex stiffening ribs that process by shaped by fluid pressure.
3. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 1, is characterized in that, the variable cross section body of described outer exhaust pipe for processing by shaped by fluid pressure.
4. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 3, is characterized in that, the variable cross section body of described internal layer exhaust pipe for processing by shaped by fluid pressure.
5. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 1, is characterized in that, described outer exhaust pipe is provided with the annular groove for positioning lathe dog.
6. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 1, is characterized in that, described internal layer exhaust pipe and outer exhaust pipe two ends are sealed by flange part or passed through flanging seal.
7. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 1, is characterized in that, described internal layer exhaust pipe and outer exhaust pipe are thin-wall stainless steel or thin-walled carbon pipe.
8. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 7, is characterized in that, the wall thickness of described internal layer exhaust pipe and outer exhaust pipe is 0.6-1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410243783.6A CN103982285A (en) | 2014-06-04 | 2014-06-04 | Engine exhaust pipe based on SCR tail gas aftertreatment technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410243783.6A CN103982285A (en) | 2014-06-04 | 2014-06-04 | Engine exhaust pipe based on SCR tail gas aftertreatment technology |
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| Publication Number | Publication Date |
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| CN103982285A true CN103982285A (en) | 2014-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410243783.6A Pending CN103982285A (en) | 2014-06-04 | 2014-06-04 | Engine exhaust pipe based on SCR tail gas aftertreatment technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112145274A (en) * | 2020-10-09 | 2020-12-29 | 南昌智能新能源汽车研究院 | Integrated vacuum layered heat-preservation exhaust pipe |
| WO2023116089A1 (en) * | 2021-12-24 | 2023-06-29 | 上海天纳克排气系统有限公司 | Engine exhaust apparatus |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1432293A (en) * | 1973-03-02 | 1976-04-14 | Nissan Motor | Motor vehicle and exhaust pipe therefor |
| DE4107539A1 (en) * | 1991-03-08 | 1992-09-10 | Audi Ag | Double-walled insulated pipe, esp. for exhaust gases - has inner and outer pipes connected at their ends by sliding connections |
| JPH07269337A (en) * | 1994-03-29 | 1995-10-17 | Toyota Autom Loom Works Ltd | Exhaust pipe for engine |
| CN201121534Y (en) * | 2007-11-07 | 2008-09-24 | 奇瑞汽车股份有限公司 | Engine exhaust manifold |
| CN102865129A (en) * | 2012-05-21 | 2013-01-09 | 柳州利和排气控制系统有限公司 | Motor vehicle tail gas emission device and motor vehicle engine tail gas catalyzer |
| CN203856561U (en) * | 2014-06-04 | 2014-10-01 | 潍坊倍力汽车零部件有限公司 | Engine exhaust pipe based on SCR tail-gas post-processing technology |
-
2014
- 2014-06-04 CN CN201410243783.6A patent/CN103982285A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1432293A (en) * | 1973-03-02 | 1976-04-14 | Nissan Motor | Motor vehicle and exhaust pipe therefor |
| DE4107539A1 (en) * | 1991-03-08 | 1992-09-10 | Audi Ag | Double-walled insulated pipe, esp. for exhaust gases - has inner and outer pipes connected at their ends by sliding connections |
| JPH07269337A (en) * | 1994-03-29 | 1995-10-17 | Toyota Autom Loom Works Ltd | Exhaust pipe for engine |
| CN201121534Y (en) * | 2007-11-07 | 2008-09-24 | 奇瑞汽车股份有限公司 | Engine exhaust manifold |
| CN102865129A (en) * | 2012-05-21 | 2013-01-09 | 柳州利和排气控制系统有限公司 | Motor vehicle tail gas emission device and motor vehicle engine tail gas catalyzer |
| CN203856561U (en) * | 2014-06-04 | 2014-10-01 | 潍坊倍力汽车零部件有限公司 | Engine exhaust pipe based on SCR tail-gas post-processing technology |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112145274A (en) * | 2020-10-09 | 2020-12-29 | 南昌智能新能源汽车研究院 | Integrated vacuum layered heat-preservation exhaust pipe |
| WO2023116089A1 (en) * | 2021-12-24 | 2023-06-29 | 上海天纳克排气系统有限公司 | Engine exhaust apparatus |
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Application publication date: 20140813 |
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